python - Scrapy prints fields but doesn't populate XML file -

i have problem prints xml files correctly doesn't populate xml file content.

the output in terminal this:

[u'tove'] [u'jani'] [u'reminder'] [u"don't forget me weekend!"]

however output site_products.xml results in (which wrong, no data):

<?xml version="1.0" encoding="utf-8"?> <items></items> 

spider.py

from scrapy.contrib.spiders import xmlfeedspider crawler.items import crawleritem  class sitespider(xmlfeedspider):     name = 'site'     allowed_domains = ['www.w3schools.com']     start_urls = ['http://www.w3schools.com/xml/note.xml']     itertag = 'note'      def parse_node(self, response, selector):         = selector.xpath('//to/text()').extract()         = selector.xpath('//from/text()').extract()         heading = selector.xpath('//heading/text()').extract()         body = selector.xpath('//body/text()').extract()         return item 

pipelines.py

from scrapy import signals scrapy.contrib.exporter import xmlitemexporter  class xmlexportpipeline(object):      def __init__(self):         self.files = {}      @classmethod     def from_crawler(cls, crawler):          pipeline = cls()          crawler.signals.connect(pipeline.spider_opened, signals.spider_opened)          crawler.signals.connect(pipeline.spider_closed, signals.spider_closed)          return pipeline      def spider_opened(self, spider):         file = open('%s_products.xml' % spider.name, 'w+b')         self.files[spider] = file         self.exporter = xmlitemexporter(file)         self.exporter.start_exporting()      def spider_closed(self, spider):         self.exporter.finish_exporting()         file = self.files.pop(spider)         file.close()      def process_item(self, item, spider):         self.exporter.export_item(item)         return item 

items.py

import scrapy                                                                                              class crawleritem(scrapy.item):     = scrapy.field()     = scrapy.field()     heading = scrapy.field()     body = scrapy.field()     pass 

settings.py

bot_name = 'crawler'                                                                                                                                                                                            spider_modules = ['crawler.spiders']                                                                     newspider_module = 'crawler.spiders' item_pipelines = {'crawler.pipelines.xmlexportpipeline': 300,} 

any appreciated.

you need instantiate crawleritem instance in parse_node() method:

def parse_node(self, response, selector):     item = crawleritem()     item['to'] = selector.xpath('//to/text()').extract()     item['who'] = selector.xpath('//from/text()').extract()     item['heading'] = selector.xpath('//heading/text()').extract()     item['body'] = selector.xpath('//body/text()').extract()     return item